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| # | Species | Formula |
| 1078 | Methyl 2-propenoate | C4H6O2 | |
| 1079 | 1,1 Dimethoxy ethene | C4H8O2 | |
| 1080 | 1,3 Dioxan | C4H8O2 | |
| 1081 | 1,4-Dioxane | C4H8O2 | |
| 1082 | Ethyl acetate | C4H8O2 | |
| 1083 | 1,2-Dimethoxyethane | C4H10O2 | |
| 1084 | 1,4 Butandiol | C4H10O2 | |
| 1085 | Diethyl peroxide | C4H10O2 | |
| 1086 | Dimethyl acetal | C4H10O2 | |
| 1087 | Acetylacetone | C5H8O2 | |
| 1088 | Ethyl propionate | C5H10O2 | |
| 1089 | Isopropyl acetate | C5H10O2 | |
| 1090 | 1,5 Pentandiol | C5H12O2 | |
| 1091 | p-Benzoquinone | C6H4O2 | |
| 1092 | p-Benzoquinone (Geo) | C6H4O2 | |
| 1093 | 1,2-Benzenediol | C6H6O2 | |
| 1094 | Hydroquinone | C6H6O2 | |
| 1095 | Resorcinol | C6H6O2 | |
| 1096 | 1,3-Cyclohexanedione | C6H8O2 | |
| 1097 | 1,4-Cyclohexanedione | C6H8O2 | |
| 1098 | 2,4-Hexanedione | C6H10O2 | |
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